Herbizid

1,163,968. Herbicides containing pyridazones. BADISCHE ANILIN-& SODA FABRIK A.G. 29 Dec., 1966 [3 Jan., 19661, No. 58123/66. Heading ASE. [Also in Division C2] A herbicidal composition contains as active ingredient a pyridazone derivative of the formula I:- in which X denotes iodine or fluorine, R' denotes a phenyl or cycloalkyl radical which may be substituted by halogen, or by trifluoromethyl or alkyl and R2 denotes an -SCH 3 -, -OOC-CH 3 - or -OCH 3 -group or the group in which R3 denotes an amino radical or α- hydroxy-#,#,#-trichloroethyl radical or the radical -COR5or and R4 denotes hydrogen or the radical - COR5 and R5 denotes hydrogen or an alkyl radical which may be substituted by halogen, and R3 also denotes the group -CO-COOH or - CO-CH=CH-COOH or -CO-CH 2 -CH 2 -COOH or the salts of these acids or the group II or in which R6 denotes a phenyl radical which may be substituted by halogen, in particular by chlorine, or an alkyl, alkoxy or alkynyl radical and R7 denotes hydrogen or alkyl, and R3 and R4 together denote the group -CO-CH 2 -CH 2 -CO- or or or or =C=O or =S=O or =N=N. The composition may contain a solid or liquid carrier and may be in the form of a solution, emulsion, suspension or dust.